Rolltop Backpack for Men, Waterproof Travel Backpack with USB Charging Port, Large Capacity Adjustable18-27L Laptop Backpack for 15.6 Inch, Expandable Casual Daypack for Work Business College-Grey

ORIGINAL DESIGN: This Roll Top backpack was originally designed by our brand Heroic Knight. This climbing backpack features a sleek appearance with adjustable capacity. The travel backpack is expandable, the size is from 11.8'' * 5.9'' * 17.7'' to 11.8'' * 5.9'' * 23.6 Inch, the capacity is from 18L to 27L, it is adjustable as you need.. EXCELLENT WATERPROOF FABRIC: This Roll Top backpack is crafted from water-resistant, abrasion-proof fabric, and enhanced with waterproof zippers. Meanwhile, the padded back panel, ensures you a more comfortable and enjoyable journey. The adjustable buckle and zipper closure of the roll-top elegantly, protect the interior and offer additional volume.. CONVENIENT USB PORT DESIGN: With the function of USB bi-directional charging, you can charge your mobile phone at any time during travel or cycling without affecting your mobile phone use.. EXTREMELY COMFORTABLE: Extremely Comfortable -- Ergonomic back system with breathable padding on the laptop backpack, and shoulder straps to reduce stress on the go. The travel carry-on backpack makes it more convenient to carry on the way. Perfect for Daily Commuter, Airplane, Work, and Business trips.. LARGE CAPACITY & ORGANIZED: Large Capacity & Organized -- The casual daypack provides a spacious compartment and a padded tech compartment, roomy for clothes, daily necessities, 15.6'' Mackbook / Laptop, tablet, and accessories.. MULTI-FUNCTION: Multi-Function -- The Multi-purpose bag is not only a carry-on casual daypack but also a perfect bookbag, laptop backpack, travel backpack, commuter backpack, and daily rucksack for men and women.